( 4 ^° y 
t ho lin , in his Treatife *De Uni cornu *, takes Notice, 
that Part of a foflil Unicorn's Horn having been cal- 
cined by Order of Chrijiian IV. King of Denmark , 
it was found to be compofed, after the'fame manner, of 
thin Layers upon Layers j whence he infers, that it 
was not the Horn of an Animal, as was commonly 
pretended, but a Tooth, and namely the Tooth of a 
Sort of Whale in the Northern Seas, called Narvhal \ 
as he had afterwards an excellent Opportunity to ve- 
rify by one of thefe Unicorn’s Horns (till flicking in 
the Skull of the Creature, which was fent to Wormius 
by Thorlacus Scutonius , Bifhop of IJland. Nor is this 
Stru&ure by any means to be looked upon as an Ef- 
fect of the Calcination, whither brought about by 
the fubterranean Steams, or by a chymical Trial, but 
is natural to the Tooth, as appears in fome mea- 
fure by a Piece of Ivory, marked 1181 (Fig. 3.); but 
Hill more plain in another marked 73 1, where feveral of 
thefe Coats are by fome Difeafe in -the Tooth a&u- 
ally feparated from each other, like the Leaves of a 
Parchment Book, the Ivory on the other Side being Hill 
firm and &ofe (Fig! 4.). This Stru&ure appears likewife 
from the Teeth of the very young Elephant which died 
at London , where the upper mofl Coat, being very 
moifl, cracked upon drying, and broke at the Top. 
N° 75*0, is Part of another dens exertus , which I 
had from the Reverend Mr. Morton , who in his Na- 
tural Hiftory of North amptonjb ire f, gives the fol- 
lowing Account of it : An extraordinary Elephant's 
Tooth , one of thofe which grow out of the upper 
Jaw , and which for their Magnitude and Lengthy 
7 De Unicornu obfervationes novae, pH' 102 - t Pa i' 2 5 2 » 
have 
